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Old 1st March 2008, 10:50 PM   #1
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Default Stumped---Floppy Drive

Iím working on another floppy drive turntable motor. This one is the Jumbo 5.25 drive. I thought the motor would run on 5 volts like the 3.5 floppy. That didnít work so I tried 12 volts, no go. If I use both voltages together it runs. Using two voltages really complicates a simple project.
I need a solution if there is one.
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Old 2nd March 2008, 06:35 PM   #2
EC8010 is offline EC8010  United Kingdom
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Measure how much current it draws from the 5V rail, then use a regulator from the 12V rail to make 5V. (You need the current measurement to decide whether the 5V regulator needs a heatsink.)
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Old 2nd March 2008, 07:03 PM   #3
poynton is offline poynton  United Kingdom
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As far as I recall, all 5.25" floppy drives used +5v and +12v rails.

I cannot remember seeing any with only +5v or +12v .


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Old 4th March 2008, 10:27 PM   #4
CBRworm is offline CBRworm  United States
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It seems to me that a lot of the old floppy drive motors were either stepper motors or servo controlled with a an external speed sensor on the flywheel.
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Old 5th March 2008, 01:58 AM   #5
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The disk spin motors are 3 phase brushless (blm) 360/300 rpm. The read/write motors are steppers. Hard to find disk motor projects, stepper motor projects are many.
Dual voltage is the working answer. 12V plus 5V makes it happy.
Beware of bad bearings in these motors. About half of my motors have bad bearings and are not usable (noise). My good motors run my TT fine. Iíve ordered some new bearings.
Thanks for the replies on the dual voltage question.
TC
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